Take it out, should be somewhere on the engine side of the top radiator hose, undo the bolts on the housing and pour boiling water on it in a cup. It should open or for air bubbles when it is fully covered with boiling water.
I found lots of technical info at http://www.altimas.net/tsb/ Look at bulletin number NTB02-047. This explains how to troubleshoot poor heater performance and it gives a procedure for replacing the thermostat. what is a pilot converter
Check for water in your oil, if so, this is a sign of bad head gasket. White smoke from the exhaust and loss of coolant with no apparent leak are all signs of a blown head gasket. You can also remove the thermostat (it is much cheaper to replace and easier to troubleshoot as well). If the temperature of the vehicle lowers, your thermostat was the problem.
Troubleshoot the voltage regulator
You need to troubleshoot the system, is the thermostat turned up, are the radiators turned on, is the boiler on and working, if all the obvious are in order then you may have a faulty water pump or blockage (solid or air) in the system.
Depends on what you mean by troubleshoot. Excel does have several auditing functions and error messages.
Thermostat stuck open or heater core clogged. Bad radiator cap or small hole in cooling system.
Low coolant? Radiator plugged or restricted? Cooling fan not working? Water pump not circulating coolant? Thermostat not opening? System airbound? Hoses collapsing? Defective radiator cap?
The PlayStation Network Knowledge has a support link that can be helpful to troubleshoot the PS3. See related link
Check the coolant, is it the right type. Check/Replace the thermostat. Make sure there is nothing blocking the radiator that can disrupt air flow to it.
English "troubleshoot" is roughly the French "dépanner": to repair. That's the closest translation that I could discover. The English phrase "please troubleshoot my computer" is in French "veuillez dépanner mon ordinateur".
troubleshoot head lamps on 1988 grand marquis? Not working...fuses OK
How do you troubleshoot a power steering leak on a 1993 Lexus ES300?"